Incandescent-lamp lock.



L. DAVIS. INOANDBSGBNT LAMP LOCK. APPLIGATION FILED JULY s1, 190e,

Patauted Apr. 26, 1910.

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UNITED STATES PATENT OFFICE.

LEVI DAVIS, OF ALTON, ILLINOIS.

INCANDESCENT-LAM'P LOCK.

Specification of Letters Patent. Pajented Apr.. 26', 19120.

Application filed. July 31, 1909. Serial No. 510,664.

To all whom 'it 'ma/y concern:

Be it known that I, Levi Davis, a. citizen of the United States. of America, residing in Alton, county of Madison, and Sta-te of Illinois, have invented certain new and useful Improvements in Incandescent- Lamp Locks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification. f

My invention relates to a device for locking incandescent lamps in their sockets t0- prevent theft of the lamp bulbs, the present invent-ion having in view the construction of a simple device of this description that may be readily applied to the socket of an ordinary incandescent lamp in its original position, thereby avoiding the necessity of deviating from the ordinary construction of the sockets, or preparing the sockets for a lock in some manner as is neeessary in order that devices of the nature of my improvement may be put into service.

Figure I is an elevation of an incandescent electric lamp Vwith my lock applied thereto. Fig. II is an enlarged view, in part a longitudinal section through the incandescent lamp socket and my lock, and in part an elevation of the neck of a lamp bulb seated in the socket and held by the lock. Fig. III is a cross section taken on line III-III, Fig. II, the end of the lamp `bulb neck being shown in full lines. Fig.

'IV is a perspective view of the band ot' my lock. F1 V is a perspective View ot' my sectional ockin` ring with the sections separated' from eacl other. Fig. VI is an end view of akey for use inconnection with my lock. Fig. VII is in part an elevation and in part a longitudinal .section of the key shownin Fig. VI.

In theaccompanying drawings: A designates a lamp bulb having the usual screw threaded neck B. A

C is the socket that receives the neck of the lamp bulb, and is provided with an internal screw threaded member D with which said lamp bulb neck engages. The socket C is provided with the usual external bead E that encircles it.

l designates the sections of a sectional lockin ring that' are adapted to be fitted aroun the socket D and be held assembled by means to be hereinafter more fully referred to. Each of the sections 1 is provided intermediate of its ends with a groove we ore shape in cross section, and which is l adaptedto extend across the lower edge of the lamp socket so that the said flanges of the two sections will engage the neck. B.

of the lamp bulb A when said neck is in position in the lamp socket. At the lower end-y of each section 1, at its exterior, is a shoul- `der 4 having utility to be hereinafter made clear. 'lhe two ring sections 1 are provided: at their abutting edges with bosses 5 and. notches t3, the-bosses being adapted toenber into the notches for the purpose of preventing endwise movement of either section independently of the other section. In each ring section is an aperture 7.

8 designates a keeper band that enci-rcles the ring sections 1 to hold them from sepaA ration, and which is provided with an outwardly extending boss 9 containing a screw threaded aperture l0 and having a recessed seat 11.

l2 is a locking screw mounted in the screw threaded aperture l0 in the keeperv band, and having at its outer end a head 13 that is in the main ot cylindrical shape, but has a flattened side li.

In applying my .lock to an incandescent lamp the two mating ring sections 1 are assembied around. the lunip socket after 'the neck of the lamp has been introduced into the socket and so tted to the socket that the bead E of said socket will occupy the groove 2 in the ring section.A In t-hus fitting the ring Sections to the socket theirinwardly extending flanges 3 are positioned immediately..beneath the lower end of the neck bea-dy of the lamp bulb, as seen in Fig. II, so that they will engage said neck. The keeper band 8 is then slipped on to the assembled locking ring sections, it being understood that the band was present around the socket above the point' at which the locking ring sections were applied before the application of said sections, and said band is moved downwardl until its lower end rests upon the-externa Shoulder-s4 of the locking ring sections which serve ,to prevent furtherA downward movementof the baud. In `fitting the keeper band around the locking ring sections, it 1s so. positioned as to eausethe -aperture 10 therein to be in registrationwith the aperture 'L in one of the ringsections,

a specially formed key 15.

in order that the lockinO screw 12 may then turn so that it is move inwardly through the aperture in the keeper band, and into the registering aperture in the adjacent locking ring section, whereby the keeper band is connected to the locking ring sections to hold them assembled, in order that they may perform their oflice of retaining the neck of the lamp bulb in the lamp socket. It is with the object in View of making it dih'icult for any one to Withdraw the locking screw 12 and thus be enabled to remove the keeper band that I make the head of said locking screw mainly of circular shape and provide onlya slight flattened portion 1-1 thereon to permit of the manipulation of the screw by This key has a hollow shank 16 that is mainly of cylindrical shape, but is flattened at the point 17 in order that it will fit the iiattened. portion 14 of the head of the locking screw. The head ot' the locking screw occupies a position within the recess in the boss 9 of the keeper band when the screw is in its inmost position, and consequently the head of the screwr is protected within said boss when my device is in service, and as a consequence, it is diiiicult for any one desiring to manipulate the. screw for the purpose otrernoving the lamp lock, todo so without the employment of the specially made key intended for that service.

I claim:

1. The combination with an incandescent electric lamp socket and a bulb seated therein, of a locking ring embraciz'ig said socket andengaging said bulb, and a keeper hand surrounding said locking ring.

2. The combination with au incandescent electric lamp socket and a bulb seated therein, of a locking ring embracing said socket and engaging said bulb, a keeper band surrounding said locking ring, and a locking member whereby said keeper band and locking ring are united.

3. The combination with an incandescent electric lamp socket and a bulb seated therein, of a locking ring embracing said socket and engaging said bulb, a keeper band surroundingr sind locking ring, and a locking member movable in said band into said locking ring whereby said parts are connected.

4. The combination with an incandescent `nected to each other.

electric lam socket and a bulb seated therein, of a locking ring embracing said socket and engaging said bulb, a -keeper band surrounding said locking ring, and a locking screw mounted in said band and movable .ment with the neck of said bulb, a keeper band surrounding said locking ring, and means movably mounted in said kee er band whereby the band may be connecte to said locking ring.

7. The combination with an incandescent electric lamp socket and a bulb seated therein, of a ring embracing said socket and provided with means for engagement with the neck of the lamp bulb and with an external shoulder, and a keeper band surrounding said locking ring to limit the degree of movement of the band upon the rinOf.

S. The combination with an incandescent electric lamp socket having an external bead and a bulb seated in said socket, of a locking ring provided with an internal groove to receive the bead of said socket, and having an inwardly extending flange at one end to engage the neck of said bulb, and a keeper band surrounding said locking ring.

9.`The combination with an incandescent electric lamp socket having an external bead and a bulb seated in said socket, of a locking .ring provided with an internal groove to receive the bead of said socket, and having an inwardly extending flange at one end to engage the neck of said bulb, a keeper band surrounding said locking ring, and means movably mounted in saidtkeeper band Whereby said band and locking-ring may be Con- LEVI DAVIS.

In the presence of- M. C. HAMMON, E. B. LINN. 

